Re: [PATCH] virtio-blk: drop deprecated scsi=on|off property

On Thu, Apr 29, 2021 at 04:52:21PM +0100, Stefan Hajnoczi wrote: > Live migrating old guests from an old QEMU with the SCSI feature bit > enabled will fail with "Features 0x... unsupported. Allowed features: > 0x...". We've followed the QEMU deprecation policy so users have been > warned... > Were they really warned, though? People running "-machine pc-i440fx-2.4" might be completely unaware that it was silently enabling a deprecated feature. Can we have this documented in a more explicit way? Maybe just a comment at hw_compat_2_4 would be enough, to warn people doing backports and rebases downstream. Can we make QEMU refuse to start if using pc-2.4 + virtio-blk together, just to be sure?